Implements the dynamic permission model required by the newer SDK and changes the theme. Bug: webrtc:8803 Change-Id: I3ea23a25b27f196fcffd018c7cdd2ff6255b62d9 Reviewed-on: https://webrtc-review.googlesource.com/44400 Commit-Queue: Sami Kalliomäki <sakal@webrtc.org> Reviewed-by: Anders Carlsson <andersc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21788}